/Engine/Source/Runtime/Engine/Classes/Engine/MapBuildDataRegistry.h
Allocates a newFMeshMapBuildDatafrom the registry. Warning: Further allocations will invalidate the returned reference.
[FMeshMapBuildData](API\Runtime\Engine\Engine\FMeshMapBuildData) & AllocateMeshBuildData ( const [FGuid](API\Runtime\Core\Misc\FGuid) & MeshId, bool bMarkDirty )